package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //1.添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.130:9092");
        //key和value的消息的反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        //设置消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group1"); // consumer1
//        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group2"); // consumer2

        //设置手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

        //2.消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);

        //3.订阅主题
        consumer.subscribe(Collections.singletonList("itcast-topic-out"));

        //4.获取消息
        /*while (true) {//当前线程一直处于监听状态
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
                System.out.println(consumerRecord.offset());
                System.out.println(consumerRecord.partition());
            }
        }*/

        // 同步提交
        /*while (true) {
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> record : records) {
                System.out.println(record.value());
                System.out.println(record.key());
                System.out.println(record.offset());
                System.out.println(record.partition());
                try {
                    consumer.commitSync();//同步提交当前最新的偏移量
                } catch (CommitFailedException e) {
                    System.out.println("记录提交失败的异常：" + e);
                }

            }
        }*/

        // 异步提交
        /*while (true) {
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> record : records) {
                System.out.println(record.value());
                System.out.println(record.key());
                System.out.println(record.offset());
                System.out.println(record.partition());
            }
            consumer.commitAsync(new OffsetCommitCallback() {
                @Override
                public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                    if (e != null) {
                        System.out.println("记录错误的提交偏移量：" + map + ",异常信息" + e);
                    }
                }
            });
        }*/

        // 同步和异步组合提交
        try {
            while (true) {
                ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> record : records) {
                    System.out.println(record.value());
                    System.out.println(record.key());
                    System.out.println(record.offset());
                    System.out.println(record.partition());
                }
                consumer.commitAsync();
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误信息：" + e);
        } finally {
            try {
                consumer.commitSync();
            } finally {
                consumer.close();
            }
        }

    }

}